Accession Number : ADA292712

Title :   Metal Nanotubule Membranes with Electrochemically Switchable Ion-Transport Selectivity.

Descriptive Note : Interim rept.,

Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY

Personal Author(s) : Nishizawa, Matsuhiko ; Menon, Vinod P. ; Martin, Charles R.

PDF Url : ADA292712

Report Date : MAR 1995

Pagination or Media Count : 20

Abstract : Membranes that contain cylindrical metal nanotubules that span the complete thickness of the membrane are described. The inside radius of the nanotubules can be varied at will; nanotubule radii as small as 0.8 nm are reported here. These metal nanotubule membranes show selective ion transport analogous to that observed in ion-exchange polymers. Ion permselectivity is observed because excess charge density can be present on the inner walls of the metal tubules. The membranes reject ions of the same sign, and transport ions of the opposite sign, as this excess charge. Because the sign of the excess charge on the tubule can be changed potentiostatically, a metal nanotubule membrane can be either cation selective or anion selective, depending on the potential applied to the membrane. jg

Descriptors :   *IONS, *METALS, *ELECTROCHEMISTRY, *TRANSPORT, *MEMBRANES, *SWITCHING, CATIONS, THICKNESS, POLYMERS, COMPOSITE MATERIALS, INTERNAL, TUBULAR STRUCTURES, WALLS, CHARGE DENSITY, ANIONS, ION EXCHANGE.

Subject Categories : Laminates and Composite Materials
      Physical Chemistry
      Fluid Mechanics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE